'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 8888 // dev port
// port开发环境服务器端口的设置
// 1.  process.env.port 是node.js服务下的环境变量 变量是在.env.development 和 .env.production 两个文件中进行设置的 一个开发环境  一个生产环境
// 当我们运行npm run dev进行开发调试的时候,就会加载development文件内容
// 当我们运行npm run build:prod 进行生产环境打包的时候,会加载执行production文件内容
// 如果想要设置开发环境的接口,在的老婆们太中写入对于port变量的赋值即可

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
     * You will need to set publicPath if you plan to deploy your site under a sub path,
     * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
     * then publicPath should be set to "/bar/".
     * In most cases please use '/' !!!
     * Detail: https://cli.vuejs.org/config/#publicpath
     */
  // 这个文件夹是vue项目相关的编译,配置,打包,启动服务相关的配置文件
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // 解决跨域问题 正向代理(代理的是客户端) 和 反向代理(代理的是服务器)
    // proxy代理 这是限于开发环境, 此时有vue- cli脚手架的辅助.可以用到proxy
    // 如果是已经打包好了交给运维,放在Nginx服务器,就需要借助Nginx的反向代理来进行
    //   server {
    //    # 监听9099端口
    //     listen 9099,
    //    # 本地的域名是localhost
    //     server_name localhost,
    //    # 凡是localhost: 9099 / api这个样子的， 都转发到真正的服务端地址http: //baidu.com
    //     location ^ ~/api {
    //     proxy_pass http: //baidu.com;
    //   }
    // },
    proxy: {
      // 要拦截地址
      '/api': {
        target: 'http://ihrm-java.itheima.net', // 要代理到的地址
        changeOrigin: true // 开启跨域
      }
    }
    // before: require('./mock/mock-server.js')
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src') // @ 是我们设置的一个路径别名,指定src根目录,方便寻找文件
      }
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [{
      rel: 'preload',
      // to ignore runtime.js
      // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
      fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
      include: 'initial'
    }])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config
      .when(process.env.NODE_ENV !== 'development',
        config => {
          config
            .plugin('ScriptExtHtmlWebpackPlugin')
            .after('html')
            .use('script-ext-html-webpack-plugin', [{
              // `runtime` must same as runtimeChunk name. default is `runtime`
              inline: /runtime\..*\.js$/
            }])
            .end()
          config
            .optimization.splitChunks({
              chunks: 'all',
              cacheGroups: {
                libs: {
                  name: 'chunk-libs',
                  test: /[\\/]node_modules[\\/]/,
                  priority: 10,
                  chunks: 'initial' // only package third parties that are initially dependent
                },
                elementUI: {
                  name: 'chunk-elementUI', // split elementUI into a single package
                  priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                  test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                },
                commons: {
                  name: 'chunk-commons',
                  test: resolve('src/components'), // can customize your rules
                  minChunks: 3, //  minimum common number
                  priority: 5,
                  reuseExistingChunk: true
                }
              }
            })
          // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
          config.optimization.runtimeChunk('single')
        }
      )
  }
}
